Gas Milage Goes from Suck to Blow

[Amnesia]

Here is your $0.99 diagnostic. (And welcome to my world.)

Get a can of carb. cleaner and while the engine is running, spray it along the intake manifold mating surface. If the engine speed changes then you've found a leak.

One other thing to check that I've had a problem with on mine, are dragging brakes. Go for a normal drive for 10-20 min. Then get out and feel the heat coming off of each rotor through the wheel spokes. If you had a brake caliper that isn't releasing properly, there'll be noticably more heat coming off of that rotor. (For more precision, use a digital, non-contact, infared thermometer.)

Good luck!

[VehiX]

Could just be that you're warming the VX up in the morning and letting it run when it's cold. So even though your not driving it and tracking milage, your still burning gas.

I've noticed bad gas milage since my VX starting throwing codes for the EGR!

Also check the air in your tires at least once a month during the cold season.